Chafetz Chaim, Part Two, The Prohibition Against Rechilut, Principle 9
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וְדַע עוֹד, דְּצָרִיךְ לִזָּהֵר בְּכָל אֵלּוּ הַפְּרָטִים שֶׁבִּכְלָל זֶה, אֲפִלּוּ אִם לֹא יִרְצֶּה, רַק לְסַפֵּר הָעִנְיָן לַאֲחֵרִים, דְּזֶה גַּם כֵּן בִּכְלַל רְכִילוּת הוּא, וּכְמוֹ שֶׁכָּתַבְנוּ לְעֵיל בְּחֵלֶק זֶה בִּכְלָל ג' סָעִיף ג'.
Chofetz Chaim, Silverstein translation
And know further, that he must be heedful of all the particulars of this principle even if he wishes to tell only others. For this, too, is in the category of rechiluth, as we wrote above in this part, in Principle III, section 3.